GE Multilin UR-8FV (UR8FV) CT/VT Module

Overview of the UR-8FV:

The GE Multilin UR-8FV is a CT/VT (Current Transformer / Voltage Transformer) module designed to replace outdated modules or upgrade existing Universal Relay systems. This module plays a crucial role in monitoring and managing AC power lines, enhancing the safety of both users and power system equipment.

The UR-8FV module supports 3-1A/5A phase CTs, 1A/5A ground CTs, and a four-terminal voltage transformer. It integrates with the Universal Relay (UR) systems to provide accurate and reliable monitoring of electrical power systems.

Key Features:

• CT/VT Support: Provides the necessary current and voltage transformer signals to the relay system for accurate monitoring.
• Phase and Ground CTs: Includes 3-1A/5A phase CTs and 1A/5A ground CTs, providing comprehensive protection and measurements for the system.
• Four-Terminal Voltage Transformer: Equipped with a four-terminal voltage transformer for precise voltage measurements.
• Size Compatibility: Commonly connected using 12 AWG wire, though the module supports up to 10 AWG wire for connections.

Benefits:

• Enhanced Safety: Improves overall safety for both users and equipment by ensuring accurate monitoring and fault detection.
• Ground Fault Protection: Some CT/VT modules, including the UR-8FV, provide sensitive ground protection, which is critical for systems with high-impedance grounded systems.
• Diagnostic Enhancements: The module offers improved diagnostics for power systems, helping detect issues before they cause damage or downtime.

Frequently Asked Questions:

1. What makes the UR-8FV different from other CT/VT modules? The UR-8FV is part of the newer CT/VT modules in the Universal Relay system. It typically features a 4CT/4VT configuration. Other modules may offer configurations with either sensitive 8CT or standard 4CT/4VT. The sensitive ground protection feature of some modules allows for much more accurate ground fault detection, particularly for high-impedance grounded systems.
2. How many signals can the CT/VT modules provide? The UR-8FV, like other CT/VT modules, can provide up to 24 CT and VT analog signals for comprehensive monitoring and fault detection of AC power lines.
3. Can old CT/VT modules be used with newer Universal Relay systems? Older CT/VT modules can be used with older Universal Relay systems that feature a compatible older CPU. However, new CT/VT modules must be matched with new CPUs to avoid potential display errors or incompatibility issues.
4. What is the key advantage of sensitive ground CT modules? Sensitive ground input modules offer significantly higher sensitivity (up to 10 times more sensitive) than non-sensitive ground CTs. This feature is especially beneficial in systems where grounding is not as straightforward or when working with high-impedance grounding systems.

Specifications:

• Manufacturer: General Electric (GE) Multilin
• Part Number: UR-8FV
• Series: Universal Relays (UR Series)
• Dimensions: Approx. 6” L x 7” W x 1.5” H
• Weight: 2 lbs 9 oz
• Software: EnerVista UR software for configuration and monitoring
• Maximum Wire Size: 10 AWG (Recommended: 12 AWG)
• Compatibility: Compatible with both older and newer Universal Relay systems based on the module and CPU version.

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